From Italy: take the motorway exit Gravellona Toce than carry-on northwards until Cannobio; in Cannobio take the street to the Valle Cannobina following the signposts about Traffiume.
From Switzerland: go through the customs of Piaggio Valmara. At about three km there is Cannobio, in Cannobio take the street to the Valle Cannobina following the signposts about Traffiume.